Following the evaluation of submissions by five US helicopter manufacturers, the US Army selected the Boeing Vertol Model 114 as most nearly meeting its requirements for a battlefield mobility helicopter. An initial contract for five YHC-1B pre-production examples was placed in June 1959, but soon after entering service these were redesignated YCH-47A and given the name Chinook.

Boeing-Vertol CH-47 Article

The Model 114 was a larger and more powerful version of the same company’s Model 107 (CH-46 Sea Knight). The non-retractable landing gear is of quadricycle configuratio, with twin wheels on each front unit and single wheels on each rear unit. Oleo-pneumatic shock-absorbers in all units. Rear units fully castoring; power steering on starboard rear unit. All wheels are size 24 x 7.7-VII, with tyres size 8.50-10-III, pressure 4.62 bars. Two single-disc hydraulic brakes each.

The Chinook’s fuselage is built around a cargo bay, in front of which is the flight deck and above it, at either end, the pylons holding the transmission for the two rotors. The two turbine engines are installed on either side of the aft pylon. The fuselage has sealed and compartmented fairing pods on each side of the lower fuselage, extending for almost three-quarters of the fuselage length to supplement the buoyancy of the sealed lower fuselage for water operations.

Self-sealing pressure refuelled crashworthy fuel tanks are in the external fairings on sides of fuselage with a total fixed fuel capacity of 3,899 litres. Provision for up to three additional long-range tanks in cargo area, each of 3,028 litres give a maximum fuel capacity (fixed and auxiliary) of 6,927 litres.

The constant cross-section cabin with side door at front and rear-loading ramp that can be opened in flight. Access to flight deck is from the cabin. Behind the cargo bay is a hydraulically-actuated ramp which greatly facilitates loading and unloading operations. On either side of the fuselage are two large fairings, housing the fuel tanks, landing gear shock absorbers and battery for the electrical system. The cargo bay has a volume of circa 42cu.m and can carry either 44 troops, 24 stretcher cases plus two medical attendants, or a weight of between eight and 11 tonnes. A hoist at the front of the bay can be used for lifting loads vertically through a hatch in the middle of the floor or for lowering items to the ground. The Chinook also has a cargo hook at the center of gravity for carrying slung loads (covered by removable floor panel so that load can be observed in flight), enabling it to operate as a flying crane.

Three cargo hooks are fitted. The centre is capable of lifting 12 tons and the other two 9 tons each.

Two three-blade intermeshing contrarotating tandem rotors, the front rotor turning anti-clockwise, has rotor transmissions driven by connecting shafts from a combiner gearbox. Classic rotor heads with flapping and drag hinges are fitted with 225 rotor rpm. The manually foldable blades, usse Boeing Helicopters VR7 and VR8 aerofoils with cambered leading-edges, and the blades can survive hits from 23mm HEI and API rounds. A rotor brake is optional. To minimize the vibrations transmitted to the fuselage by the rotors, the helicopter has five vibration absorbers, one in the nose, two under the cockpit floor and two inside the aft pylon.
Differential fore and aft cyclic is for pitch attitude control, and differential lateral cyclic pitch (from rudder pedals) for directional control. Automatic control to keep fuselage aligned with line of flight. Dual hydraulic rotor pitch-change actuators: secondary hydraulic actuators in control linkage behind flight deck for autopilot/autostabiliser input; autopilot provides stabilisation, attitude hold and outer-loop holds.
A 67shp Solar turbine at the base of the aft pylon drives the electric generators and hydraulic pumps. The hydraulic system comprises a utility system, a No.1 flight control system and a No.2 flight control system. Electrical system includes two 40kVA air-cooled alternators driven by transmission drive system. Solar T62-T-2B APU drives a 20kVA generator and hydraulic motor pump, providing electrical and hydraulic power for main engine start and system operation on the ground.
Two pilots on the flight deck, with dual controls have a jettisonable door on each side of flight deck. Depending on seating arrangement, 33 to 55 troops can be accommodated in main cabin, or 24 litters plus two attendants, or vehicles and freight. Rear-loading ramp can be left completely or partially open, or can be removed to permit transport of extra-long cargo and in-flight parachute or free-drop delivery of cargo and equipment.
Main cabin door, at front on starboard side, comprises upper hinged section which can be opened in flight, and lower section with integral steps. Lower section is jettisonable. Triple external cargo hook system, with centre hook rated to carry maximum load of 11,793kg and the forward and rear hooks 7,711kg each, or 10,433kg in unison. Provisions are installed for a power-down ramp and water dam to permit ramp operation on water, for forward and rear cargo hooks, internal ferry fuel tanks, external rescue hoist, and windscreen washers.

The first YHC-1B made its initial flight on 21 September 1961, by which time the first production contract for CH-47A aircraft had been placed. These were powered initially by 1641kW Lycoming T55-L-5 turboshafts (subsequently by 1976kW T55-L-7 turboshafts), and deliveries of CH-47As began in December 1972.
The CH-47B replaced the original model, and was chosen by the US Army as the standard troop transport for the First Cavalry Division (Airmobile). The CH-47B is recognisable by the two thin fins at the base of the rear ramp, and has more powerful 2125kW T55-L-7C turboshafts, redesigned rotor blades and other detail refinements, the first of two prototypes making its first flight during October 1966, with deliveries beginning on 10 May 1967.
The CH-47B was followed by the CH-47C (Model 234) which had new 3802shp / 2,796kW T55-L-11A engines, strengthened transmission and new, larger 3,944 litres capacity fuel tanks. The first CH-47C flew on 14 October 1967 and deliveries began in spring 1968.
Nine aircraft similar to the CH-47C have been built for the Canadian Armed Forces, under the designation CH-147; deliveries began in September 1974. The CH-147 has the latest safety features and an advanced flight-control system, with a maximum land take-off weight of 22680kg and emergency water take-off weight of 20865kg.

Licence production of the CH-47C has also been undertaken by Ellicotteri Meridionali in Italy since 1970. Agusta, SIAI-Marchetti, and other Italian manufacturers are also involved in this programme.
After a number of setbacks, an order was confirmed for 26 CH-47Cs for the Italian Army and the first wholly Italian aircraft were delivered in 1974. The Italian order was followed first by an order for the Iranian Army (initially 20 aircraft) and then for Libya, Morocco, Egypt, Tanzania and Greece.

Under a US Army development programme, one each of the models CH-47A, CH-47B, and CH-47C were stripped down to the basic airframe, and rebuilt to an improved standard to serve as CH-47D prototypes. These upgraded CH-47Ds have more-powerful turboshaft engines and higher-rated transmissions; a redesigned avionics; and many design refinements. They also introduce an auxiliary power unit and a triple hook cargo-suspension system. Following a successful conclusion to flight testing of these prototypes by the US Army, Boeing Vertol started a programme of remanufacturing CH-47As to CH-47D standard, and the first of these was delivered in 1982.

The modernised CH-47D Chinook has been operational with the US Army since February 1984, and offers a payload more than twice that of the original CH-47A. Plans called for the eventual update of 436 CH-47A/B/Cs to D standard. Conversion rate was four per month, and the programme was scheduled to continue until 1993. Changes incorporated include uprated T55-L-712 engines and rotor transmission system, the latter with integral lubrication and cooling. Composite rotor blades are fitted, and avionics and other systems are upgraded. A CH-47D equipped with a retractable 11.6m (38ft) probe successfully completed in-flight refuelling trials with a USAF HC-130 tanker in 1985. Improvements developed for the CH-47D have been built into the current military export version, the CH-47D International Chinook (formerly the Model 414). Spain received six of these between July 1986 and April The 1987, with Bendix RDR-1400 weather radar mounted in the nose.

Under the designation Chinook HC. Mk 1, the Royal Air Force ordered 33 examples similar to the Canadian CH-147. They have British avionics and equipment, and a number of special provisions. The first was handed over in August 1980, and delivery of all 33 was completed during early 1982.

Ultimately, the CH-47 Chinook appeared in a D model with an export variant designated as the CH-47 “International Chinook”.

Production by Boeing Vertol of new military Chinooks became limited to orders for the Model 414, which is an international export version and the MH-47E, a Special Forces variant of the CH-47D with night/low flying avionics and an inflight-refuelling probe.

Kawasaki license-produced the CH-47 “D” model as the CH-47J and CH-47JA models. The CH-47J is essen¬tially a CH-47D International Chinook, and a total of 54 were required by the JASDF/JGSDF.
Australia signed an order for 12 CH-47C Chinooks in March 1972 and these aircraft went into service with 12 Squadron, RAAF, based at Amberley.

From January 1991, 100 CH-47Ds fitted with engine air particle separator (also available for RAF variant). Standard in MH-47E and optional in International Chinook are two AlliedSignal T55-L-714 turboshafts, each with a standard power rating of 3,108kW continuous and emergency rating of 3,629kW. CH-47SD has T55-L-714A turboshafts with maximum continuous rating of 3,039kW. FADEC installed on late production CH-47Ds and CH-47SD. Normal fuel capacity in CH-47DS and MH-47E is 7,828 litres, but MH-47E can also operate with three long-range tanks in cargo area, each containing 3,028 litres, bringing total fuel capacity to 16,913 litres. CH-47D SOA and MH-47E have 8.97m refuelling probe on starboard side of forward fuselage.
US Army modernized some 300 of their 431 D-models to CH-47F standard with more powerful engines, as well as vibration reduction, improved avionics and digital mission systems and map display. The CH-47F first flew early in July 2001.

In late 1965, the first Armed/Armoured Chinook (ACH-47) was officially rolled out and testing was begun. The Armed/Armoured Chinook mounts an array of armament, as well as armor to protect the crew and vital parts of the aircraft against heavy calibre ground fire.
Mounted on the nose was an M-5 40mm Automatic Grenade Launcher. This turret-mounted weapon was controlled by the copilot, who was able to cover an extensive area on either side of the flight path. Complementing this nose turret, pylons on each side of the aircraft carried fixed forward-firing weapons including a 22mm gun and either a 19-round 2.75 inch rocket pod, or a 7.62mm high-rate-of-fire Gatling machine-gun.
The sides of the aircraft were protected by four gunners stationed two to either side of the cabin. Each of these gunners was provided with either a 7.62mm or 12.7mm calibre machine-gun on flexible mounts. Another gunner was stationed aft with the same type weapons mounted on the rear loading ramp. From this vantage point, the gunner could protect the aircraft from ground fire after the aircraft had passed. This aircraft carried a ton of expendable munitions. The Armed/Armoured Chinook was provided with a new type of steel armour plate which was built into the crew seats and protected their torsos. Similar in configuration to the CH-47A, three of these were evaluated in Vietnam, but no further examples were built.

Despite their design capability, on one memorable occasion in Vietnam a Chinook evacuated 147 refugees and their possessions in a single flight.

After the CH-47D, Boeing Vertol completed a project in summer 1978 for a commercial version of the same aircraft, primarily intended for operators of oil platforms but also suitable for the prospecting of remote areas.
The airframe of the Model 234 is based on that of the military Chinooks, but has many new features such as fiberglass blades of larger chord in place of metal ones, different-sized fairings along the sides of the fuselage containing fuel, a longer nose to house the weather radar and front landing gearwheels shifted farther forward.

Two versions of the Model 234 were available: Model 234LR – a long-range version with lateral fairings almost twice the size of the original Chinook ones, which have 6360kg fuel capacity, and Model 234UT – a utility version in which the fuel tanks of 1826kg are contained in four smaller fairings level with each wheel. The helicopter can be converted from one version to the other. The three rotor blades are interchangeable and maintenance has been reduced to a minimum, with considerable savings in running costs. The service life of the engines has also been increased to 1800 hours TBO.
The rotors of the civil Chinook are powered by two Textron Lycoming AL 5512 turboshafts, pod-mounted on sides of rear rotor pylon, via a combining gearbox and interconnecting shafts which enable both rotors to be driven in emergency by either engine. Each engine has maximum T-O rating of 3,039kW, maximum continuous rating of 2,218.5kW, and 30 minutes contingency rating of 3,247kW.

The passenger compartment of the long-range version has 44 seats arranged in four rows with a central corridor and there is a baggage compartment at the rear of the fuselage; it has a crew of three. The 234LR is fitted with cabin windows similar to those of the Boeing 727 airliner, airliner seats at 84cm pitch, overhead baggage lockers, and a number of other ‘airliner’ features. In all-passenger versions of the 234, a galley and toilet are fitted. A typical mixed combination in the utility version consists of 11 passengers and 7250kg of freight. This version also has a cargo hook at the center of the fuselage capable of lifting up to 12700kg, and external cargoes slung from as many as four separate hooks.
Long-range model has two fuel tanks, one in each fuselage side fairing, with total capacity of 7,949 litres. Utility model has two drum-shape internal tanks, with total capacity of 3,702 litres. Extended-range model has both fuselage side and internal drum tanks. Single-point pressure refuelling.
The 234LR has more power and greater take-off weight (23133kg with an external load compared with 20865kg of the military model). The helicopter can carry an internal load of 9526kg in the cabin, which is 9.19m long, 2.51m wide, and 1.98m high.
The first Commercial Chinook made its maiden flight on 19 August 1980, and FAA and CAA certification came on 19 and 26 June 1981 respectively. The FAA and CAA certificated the 234 LR Combi in the Summer of 1982. In the 10 months since the first flight, two BV 234s completed 425 hrs of testing in 361 flights. It had been certificated at a weight of 48,500 lb / 22,000 kg and a range of 565 nm / 1047 km.
The first order for the Boeing Vertol 234 came from British Airways Helicopters in 1978 for three (later increased to six), to meet a requirement for offshore work in the North Sea accepting the first in December 1980. Since then Helicopter Service in Norway and ARCO in Alaska have also put the type in service for offshore support.

The BV.234UT conversion for fire fighting and can carry a 3000 USG bucket as an underslung load. There are two 500 USG fuel tanks installed inside the fuselage, but 20 seats are retained.

Total 735 CH-47A/B/C built and 479 CH-47D/MH-47E conversions authorised for US Army. Another 166 built by Boeing for export customers together with 45 kits. Agusta (Meridionali) production totals 136, with Kawasaki having built 54 by January 1999. Total Chinook orders, including civil, amount to 1,155.
As well as for the US Army, the Chinook has been built for the Royal Australian Air Force (12) and the Spanish Ejercito del Aire (12), and others have been sold to Argentina, and Thailand.

Gallery

Versions:

CH-47A: Initial production version, powered by two 1,640kW Lycoming T55-L-5 or 1,976kW T55-L-7 turboshaft engines. Total 354 built for US Army.

CH-47B: Developed version with 2,125kW T55-L-7C turboshaft engines, redesigned rotor blades with cambered leading-edge, blunted rear rotor pylon, and strakes along ramp and fuselage for improved flying qualities. First of two prototypes flew for the first time early October 1966. Deliveries began 10 May 1967. Total 108 built for US Army.

CH-47C: Developed version with uprated transmissions and 2,796kW T55-L-11A; integral fuel capacity increased to 3,944 litres; first flight 14 October 1967; 270 delivered to US Army from Spring 1968; 182 US Army CH-47Cs retrofitted with composite rotor blades; integral spar inspection system (ISIS) introduced 1973 together with crashworthy fuel system retrofit kit. Transmissions of some As and Bs upgraded to CH-47C standard.
Agusta (Meridionali) built 136 by 31 December 1995.

CH-47D: US Army contract to modify one each of CH-47A, B and C to prototype Ds placed 1976; first flight 11 May 1979; first production contract October 1980; first flight 26 February 1982; first delivery 31 March 1982; initial operational capability (IOC) achieved 28 February 1984. First multiyear production contract awarded 8 April 1985 for 240 aircraft; second multiyear production contract for 144 CH-47Ds awarded 13 January 1989, bringing total CH-47D (and MH-47E) ordered to 472; further two Gulf War attrition replacements authorised August 1992 (these new-build); seven ex-Australian rebuilds funded June 1993 for delivery January to November 1995.
CH-47D update included strip down to bare airframe, repair and refurbish, fit AlliedSignal T55-L-712 turboshafts, uprated transmissions with integral lubrication and cooling, composite rotor blades, new flight deck compatible with night vision goggles (NVG), new redundant electrical system, modular hydraulic system, advanced automatic flight control system, improved avionics and survivability equipment, Solar T62-T-2B APU operating hydraulic and electrical systems through accessory gear drive, single-point pressure refuelling, and triple external cargo hooks. Principal external change is large, rectangular air intake in leading-edge of rear sail. Composites account for 10 to 15 per cent of structure. About 300 suppliers involved.
Test programme began late 1995 of Chinook with vibration-reducing dynamically tuned fuselage.

MH-47D Special Operations Aircraft: Two battalions equipped with 11 CH-47D SOA fitted with refuelling probes (first refuelling July 1988), thermal imagers, AlliedSignal RDR-1300 weather radar, improved communications and navigation equipment, and two pintle-mounted 7.62mm machine guns. Navigator/commander’s station also fitted.

GCH-47D: At least 12 Chinooks grounded for engineer training.

JCH-47D: Two CH-47Ds modified for special testing.

MH-47E: Special Forces variant; planned procurement 51, deducted from total 472 CH-47D conversions but only 25 received, including 14 not covered by multiyear production contract; prototype development contract 2 December 1987. Prototype (88-0267) flew 1 June 1990; delivered 10 May 1991; initial production aircraft flown 1992. Following mission software problems, deliveries began January 1994; last of 26 (including prototype) received April 1995.

MH-47E has nose of Commercial Chinook to allow for weather radar, if needed; forward landing gear moved 1.02 m (3 ft 4 in) forward to allow for all-composite external fuel pods (also from Commercial Chinook) that double fuel capacity; Brooks & Perkins internal cargo handling system. Chinook HC. Mk 2/2A: RAF version; Mk 1 designation CH47-352; all survivors of original 41 HC. Mk 1s upgraded to HC. Mk 1B; UK MoD authorised Boeing to update 33 (later reduced to 32) Mk 1Bs to Mk 2, equivalent to CH-47D, October 1989; changes include new automatic flight control system, updated modular hydraulics, T55-L-712F power plants with FADEC, stronger transmission, improved Solar 71 kW (95 shp) T62-T-2B APU, airframe reinforcements, low IR paint scheme, long-range fuel system and standardisation of defensive aids package (IR jammers, chaff/flare dispensers, missile approach warning and machine gun mountings). Smiths Industries HUMS being installed. Requirement exists for FLIR. Conversion continued from 1991 to July 1995. Chinook HC. Mk 1B ZA718 began flight testing Chandler Evans/Hawker Siddeley dual-channel FADEC system for Mk 2 in October 1989. Same helicopter to Boeing, March 1991; rolled out as first Mk 2 19 January 1993; arrived RAF Odiham 20 May 1993; C(A) clearance November 1993. Final Mk 1 withdrawn from service, May 1994, at which time 11 Mk 2s received. Further three new-build Mk 2s ordered 1993, for delivery from mid-1995; decision to order further 14 Mks 2A/3 announced March 1995. Mk 2A has dynamically tuned fuselage. Total RAF procurement 58 CH-47C/D/Es. First HC. Mk 2A handed over in USA 6 December 1997; arrived UK for clearance trials 18 December; remainder delivered by end of 1998.

Chinook HC. Mk 3: Eight of 14 additional RAF Chinooks announced March 1995 assigned to Special Forces; configuration similar to MH-47E, including large fuel panniers, weather radar and refuelling probes. First flight mid October 1998; deliveries from March 2000.

HT.17 Chinook: Spanish Army version.

Boeing 414: Export military version; superseded by CH-47D International Chinook.

CH-47D International Chinook: Boeing 414-100 first sold to Japan; Japan Defence Agency ordered two for JGSDF and one for JASDF Spring 1984; first flight (N7425H) January 1986 and, with second machine, delivered to Kawasaki April 1986 for fitting out; co-production arrangement (see under Kawasaki). International Chinook available in four versions with combinations of standard or long-range (MH-47E type) fuel tanks and T55-L-712 SSB or T55-L-714.

CH-47SD ‘Super D’: Latest variant on offer for export; embodies some improvements first installed on the MH-47E for US special operations forces. AlliedSignal T55-L-714A turboshaft with FADEC chosen as standard power plant; single-point pressure refuelling and jettison capability on both sides of aircraft, with fuel contained in two ballistic and crash-resistant tanks; total usable capacity is 7,828 litres (2,068 US gallons; 1,722 Imp gallons); CH-47SD also has Smiths digital fuel quantity gauging system in place of Ragen analogue system. Simplified structure offers benefits in maintainability and reliability.
CH-47SD also incorporates modernised NVG-compatible cockpit with avionics control management system (ACMS), utilising proven military and commercial off-the-shelf equipment on single console to reduce pilot workload and with provisions for growth. Avionics suite is comparable to that of baseline CH-47D, but features two embedded INS/GPS units as well as AN/ARN-147 VOR/ILS and AN/ARN-149 ADF, plus space and power provisions for Tacan. Rollout scheduled for 31 October 1999.

CH-47F Improved Cargo Helicopter (ICH): Boeing programme for improved Chinook configuration for US Army involving the development and production of a new version that will remain operational and cost-effective until a new cargo helicopter is developed between 2015 and 2020 under the current Army Aviation Modernisation Plan.

234 LR Long Range: About twice CH-47 fuel load in composites tanks attached to fuselage flanks with anti-vibration mounts; flight deck floor on shockmounts; 44-passenger interior (on shockmounts), with toilet and galley, based on Boeing airliners; walk-on baggage bins on rear ramp; alternative mixed passenger/cargo or all-cargo layouts.

234 ER Extended Range: Typical configurations are 17 passengers and two tanks for additional 1,621km or 32 passengers and single cabin fuel tank; FAA certificated May 1983.

234 UT Utility: External fuel cells replaced by two cylindrical tanks in forward fuselage: FAA supplemental-type certificate October 1981 at maximum gross weight 23,133kg with external loads up to 12,700kg on single hook; approved for 24 passengers and operation at up to 3,660m at full gross weight. No known orders, but several converted to this configuration.

234 MLR Multipurpose Long Range: Similar to 234 LR but with utility interior; can be reconfigured in 8 hours; four men can handle cabin cylindrical fuel tanks and ramp baggage bins.

234-100: Commercial equivalent of CH-47D Chinook, proposed to be built in China under co-production agreement between Boeing and Harbin Aircraft Manufacturing Company (HAMC). Minimum launch commitment set at 10 units, with at least 50 required over a five-year period to make it economically viable.

234 Combi: Firefighting modification by Columbia Helicopters equipped to carry 19 firefighters and equipment, capable of dropping 11,370 litres of water. Also carries 9,854 litre Bambi bucket.

Specifications:

Boeing Vertol Model 114

YHC-1B / YCH-47A Chinook
Engines: 2 x 1641kW Lycoming T55-L-5 turboshafts – subsequently 1976kW T55-L-7 turboshafts
Fixed fuel capacity: 3,899 lt
Long-range fuel: 2 x 3,028 lt
Maximum fuel capacity (fixed and auxiliary): 6,927 lt.
External cargo hook capacity centre: 11,793kg
External cargo hook capacity forward/rear: 7,711kg each
Max external load: 10,433kg

CH-47A:
Engines: 2 x 1,640kW Lycoming T55-L-5 or 1,976kW T55-L-7 turboshaft engines.

CH-47B
Engines: 2 x T55-L-7C turboshafts, 2125kW / 2850 shp
Rotor dia: 60 ft 0 in (18.29 m)
Length: 99 ft 0 in (30.18 m)
Height: 18 ft 7 in (5.67 m)
Max TO wt: 40,000 lb (18,144 kg)
Max level speed: 144 mph (232 kph)

Model 234 / CH-47C
Engines: 2 x 3802shp / 2,796kW T55-L-11A
Fuel capacity: 3,944 litres
Length: 51 ft.
Length with rotors turning: 30.18m
Height: 5.68m
Rotor dia: 18.29m, 60 ft.
Max speed: 286km/h
Cruise Speed: 257km/h, 120 knots
Ceiling: 15,000 ft.
Service ceiling: 3290m
Radius of Action internal fuel: 240km
Max ROA: 750km
Range: 1,420 miles.
Seating: 33 fully equipped soldiers
Empty weight: 9736kg
Max take-off weight: 17463kg
Internal load cap: 22,000 lb
External load cap: 25,000 lb
Crew: 2 pilots, 1 Loadmaster, 1 aircrew

CH-147
Maximum land take-off weight: 22680kg
Emergency water take-off weight: 20865kg.

CH-47D
Engines: 2 x AlliedSignal T55-L-712 turboshafts, 4431shp
APU: Solar T62-T-2B
Rotor dia: 18.3 m.
Fuselage length: 15.5 m.
No. Blades: 2 x 3.
Length: 51.02ft (15.55m)
Height: 18.93ft (5.77m)
Maximum Speed: 180mph (290kmh; 157kts)
Maximum Range: 264miles (425km)
Rate-of-Climb: 1,522ft/min (464m/min)
Service Ceiling: 8,448ft (2,575m)
HIGE: 8200 ft.
HOGE: 4950 ft
Accommodation: 3 + 35 (up to 55)
Empty Weight:23,402lbs (10,615kg)
Maximum Take-Off Weight: 50,001lbs (22,680kg)
Payload: 12,065 kg.
Fuel cap: 3900 lt.
Crew: 3.
Pax: 33.

Model 414 / CH-47D International Chinook
Engine: 2 x Textron Lycoming T55-712 SSB, 4431shp.
Instant pwr: 2237 kW.
MTOW: 24,494 kg.
Payload: 10,670 kg.
Max speed: 156 kts.
HOGE: 10,100 ft.
Crew: 2.
Pax: 44

CH-47F Chinook
Engine: 2 x Honeywell T55-GA-14A-714

Chinook HC. Mk 1

Chinook HC. Mk 1B

Chinook HC. Mk 2
Engines: 2 x T55-L-712F
APU: Solar 71 kW (95 shp) T62-T-2B

Chinook Mk 2A

Chinook HC. Mk 2/2A

Chinook Mks 2A/3

Chinook HC. Mk 3

HT.17 Chinook

CH-47 “International Chinook”
Engines: 2 x T55-L-712 SSB or T55-L-714

GCH-47D

JCH-47D

MH-47D Special Operations Aircraft

MH-47E
Engines: 2 x AlliedSignal T55-L-714 turboshafts, standard power rating of 3,108kW continuous and emergency rating 3,629kW
MTOW: 24,494 kg.
Payload: 12,284 kg.
Normal fuel capacity: 7,828 litres
Long-range fuel capacity: 16,913 litres
Max speed: 154 kts.
Max range: 1136 km.
HIGE: 9800 ft.
HOGE: 5500 ft.
Crew: 2.
Pax: 44

CH-47J

CH-47JA

CH-47SD ‘Super D’
Engines: 2 x T55-L-714A turboshafts, maximum continuous rating 3,039kW
Normal fuel capacity: 7,828 lt (2,068 US gallons; 1,722 Imp gallons)

Armed/Armoured Chinook / ACH-47
Armament: 1 x M-5 40mm Automatic Grenade Launcher
1 x 22mm gun
1 x 19-round 2.75 inch rocket pod, or 1 x 7.62mm Gatling machine-gun.
5 x 7.62mm or 12.7mm calibre machine-gun

Model 234LR
Engines: 2 x Textron Lycoming AL 5512 turboshafts T-O rating of 3,039kW, maximum continuous rating of 2,218.5kW, and 30 minutes contingency rating of 3,247kW.
TBO: 4000 hrs.
Main rotor: 60 ft.
Length: 99 ft.
Height: 18.7 ft.
Max ramp weight: 48,500 lbs.
Max takeoff weight: 48,500 lbs.
Standard empty weight: 25,200 lbs.
Max useful load: 23,300 lbs.
Zero fuel weight: 26,403 lbs.
Max landing weight: 48,500 lbs.
Max sling load: 28,000 lbs.
Max internal load: 9526kg
Disc loading: 8.6 lbs/sq.ft.
Power loading: 7.2 lbs/hp.
Max rate of climb: 1180 fpm.
Service ceiling: 8500 ft.
Hover in ground effect: 8500 ft.
Hover out of ground effect: 2700 ft.
Max speed: 145 kts.
Normal cruise @ 5000 ft: 135 kts.
Fuel flow @ normal cruise: 2650 pph.
Endurance @ normal cruise: 5.1 hr.
Cabin: 9.19m x 2.51m x 1.98m
Max usable fuel: 14,091 lbs / 7,949 lt / 6360kg
Passenger capacity; 44

234UT
Engines: 2 x Textron Lycoming AL 5512 turboshafts T-O rating of 3,039kW, maximum continuous rating of 2,218.5kW, and 30 minutes contingency rating of 3,247kW.
Engine TBO: 1800 hr
Rotor diameter: 18.29m
Length with rotors turning: 30.18m
Height: 5.68m
Maximum gross weight: 23,133kg
Empty weight: 9576kg
Max speed: 269km/h
Hovering ceiling: 3155m
Service ceiling: 4570m
Range: 1010km
Fuel capacity: 1826kg / 3,702 lt
Cabin: 9.19m x 2.51m x 1.98m
Max external load: 12,700kg
Passenger: 24
Ceiling: 3,660m

234 MLR Multipurpose Long Range

234-100

234 Combi

In 1956, Vertol began preliminary design and engineering of a twin-turbine transport helicopter for commercial and military applications. The main objective was to take full advantage of the high power, small size and light weight of the shaft-turbine engines then becoming available. To achieve the best possible hovering performance, the traditional Vertol tandem-rotor layout was retained, and the turbines were mounted above the rear of the cabin, on each side of the aft rotor pylon. This results in maximum unobstructed cabin area and permits the use of a large rear ramp for straight-in loading of vehicles and bulky freight.

Boeing-Vertol 107 / CH-46 Article

Construction of a prototype, designated Model 107, was started in May 1957, and this aircraft flew for the first time on 22 April 1958, powered by two 641kW Lycoming T53 turboshaft engines. It was designed for water landing capability, without the addition of special flotation gear or boat hull design, and was intended to carry 23 to 25 passengers in normal airline standard accommodation.

The new Model 107 prototype N74060 with two 877shp Lycoming T53 turbines flew on 12 August 1958.

In July 1958, the US Army ordered 10 Model 107s, designated YHC-1A; seven with the uprated 1065shp General Electric YT58 turbine and three with the Lycoming T53, and a rotor diameter increased by 0.6m.

The first YHC-1A flew on 27 August 1959, but in the meantime, the US Army had ordered five YHC-1Bs (Model 114 later known as the CH-47 Chinook), a scaled-up variant which was better suited to meet its need for a tactical transport helicopter, and consequently the order for the Model 107 was reduced to only three machines (serials 58-5514 through -5516). These machines were used primarily to familiarize Army flight crews with the capabilities of turbine-powered helicopters, and all three were eventually returned to the manufacturer.

The third of these was later returned to the company which equipped it with 783kW General Electric T58-GE-6 turboshaft engines and rotors of increased diameter, and this derivative was fitted out with a commercial interior as the Model 107-II prototype. This first flew on 25 October 1960. By that time Vertol had become a division of The Boeing Company. The first production model of the airliner spec 107 II followed on 19 May 1961 and FAA certification was received on 26 January 1962, entering scheduled service with New York Airways 1 July that year. Eight helicopters were delivered and began scheduled services between mid town Manhatten and Kennedy and La Guardia aoirports. Following this initial order remaining commercial variants were built by Kawasaki.

When the US Navy set up a new design competition for a medium-lift transport helicopter in 1960, this was won by the Boeing-Vertol 107M, a modified version of the YHC-1A powered by T58-GE-8 engines in February 1961. A batch of 50 was initially ordered, the first of which was tested in October 1962. Ordered into production under the designation HRB-1 (changed to CH-46A Sea Knight in 1962), the 107M was used for troop transport. The first order for the CH-46A assault transport version for the US Marine Corps was placed in February 1991, with first flight on 16 October 1962. This basic model accommodates a typical total of 26 troops or 15 casualty litters.

In 1963 Sweden bought four more Boeing Vertol 107, bringing to 13 the total ordered for its Air Force and Navy, designated HKP-4.

Testing continued into late 1964, with the first US Marine squadrons taking these aircraft into service in early 1965.
Four squadrons were operating CH-46As by June 1965 and the type entered service in Vietnam in March 1966, replacing the Sikorsky H-34.During the V ietnam War the Marines also installed a 7.62mm machine gun, which was fired through the cabin door. A total of 498 have been ordered by the Marine Corps and 24 by the US Navy.
Several variants have been produced including the CH-46A for the Marines (160); the UH-46A Sea Knight for the US Navy (24) with first deliveries to Utility Helicopter Squadron 1 in July 1964) the CH-46D for the USMC, generally similar to the CH-46A, but with 1044kW T58-GE-10 turboshaft engines (266); the UH-46D for the US Navy (10); the UH-46B for evaluation by the USAF; the RH-46E minehunters for the US Navy, and the CH-46F for the Marines , generally similar to the CH-46D, but with additional avionics (174).
The US Navy UH 46 model accommodated a typical total of 26 troops or 15 casualty litters but also able to carry 3175 kg (7,000 lb) of cargo, including vehicles loaded through the full section rear ramp door, for use in the vertrep (vertical replenishment) of ships at sea. Both Sea Knight families can have rescue hoists and are equipped for limited amphibious operation, though they are not intended for sustained alighting on rough seas.
Some 669 Sea Knights were built; US Navy and Marine Corps models serving in Operation Desert Storm.
A total of 624 models were delivered by 1971, and most surviving examples have been subjected to major update programmes which include fitting glassfibre rotor blades. The best 273 Sea Knights in US Marine Corps service were progressively being rebuilt as CH 46E helicopters with the more powerful 1394kW General Electric T58-GE-16 turboshaft engines, replacing the 1,250 or 1,400 shp (932 or 1044 kW) T58 engines origi¬nally fitted, as well as numerous improvements to improve reliability, res¬cue capability and ability to survive a crash on land or on water. Since 1981, 368 kits were supplied to provide further modifications to im¬prove safety and reduce costs.
The CH/UH-46 carries a crew of three, 25 troops and troop commander. Door at front of troop compartment on starboard side. Door is split type; upper half rolls on tracks to stowed position in fuselage crown, lower half is hinged at the bottom and opens outward, with built-in steps. Loading ramp and hatch at rear of fuselage can be opened in flight or on the water. Floor has centre panel stressed for 1,464kg/sq.m. A row of rollers on each side for handling standard military pallets or wire baskets. Outer portion of floor is vehicle treadway stressed for 454kg rubber-tyred wheel loads. Cargo and personnel hoist system includes a variable-speed winch capable of 907kg cable pull at 9m/min for cargo loading or 272kg cable pull at 30m/min for personnel hoisting; it can be operated by one man. A 4,535kg capacity hook for external loads is installed in a cargo hatch in the floor.
The cabin is heated by a Janitrol combustion heater and hydraulic system provides 105kg/sq.cm pressure for flying control boost, 210kg/sq.cm for other services. Electrical system includes two 40kVA AC generators and a Leland 200A DC generator. Solar APU provides power for starting and systems check-out.
CH-46 has dual stability augmentation systems and automatic trim system.
Featuring two three-blade rotors in tandem, rotating in opposite directions. The CH/UH-46 has power-operated blade folding. Power is transmitted from each engine through individually overrunning clutches into the aft transmission, which combines the engine outputs, thereby providing a single power output to the interconnecting shaft which enables both rotors to be driven by either engine.
The structure is square-section stressed-skin semi-monocoque structure built primarily of high-strength bare and alclad aluminium alloy. Transverse bulkheads and built-up frames support transmission, power plant and landing gear. Loading ramp forms undersurface of upswept rear fuselage on utility and military models. Baggage container replaces ramp on airliner version. Fuselage is sealed to permit operation from water.
Non-retractable tricycle landing gear has twin-wheels on all three units. Oleo-pneumatic shock-absorbers manufactured by Loud (main gear) and Jarry (nose gear). Goodyear tubeless tyres size 8 x 5.5, pressure 10.55kg/sq.cm, on all wheels. Goodyear disc brakes.

Six utility models, almost identical to the CH-46A, were delivered to the RCAF in 1963-4 under the designation CH-113 Labrador, and 12 similar aircraft were built for the Canadian Army during 1964-5, these being designated CH-113A Voyageur. The CH 113 Labrador had a range of over 650 miles (1,050 km). Under a Canadian Armed Forces’ Search And Rescue Capability Upgrade Project (SARCUP), Boeing of Canada was contracted to modify six CH-113s and five CH-113As to an improved SAR standard by mid-1984, with extra fuel, weather radar, a water dam for use of the rear ramp at sea and an APU (auxiliary power unit).

In 1962-3 Boeing Vertol supplied 14 Model 107-IIs to Sweden for service with the air force in the search and rescue role, and with the navy for ASW and minesweeping duties: both of these versions have the designation HKP-4. Sweden uses the Gnome engined HKP 7 version for ASW and mines¬weeping duties.

Kawasaki Heavy Industries obtained a licence in December 1965 to build the Model 107 in Japan in civil and military versions resulting in 12 new versions: the KV-107/11-2 commercial version for passenger transport adopted by Kawasaki, the Thai government and New York Airways; the KV-107/11-3 minehunters; the KV-107/11-4 for tactical transport, 59 of which have been built for the Japanese Ground Self-Defense Force; the KV-107/11-5 rescue version for the Japanese Air Self-Defense Force and the Swedish Navy (38 built); the KV-107/11-7 six-eleven-seat VIP transport version, only one of which has been built for the Thai government; and the KV-107/IIA version for hot climates and high altitudes.
Kawasaki obtained in 1965 exclusive rights to manufacture this tandem rotor helicopter and sell it worldwide. The first KV107II obtained Japanese and US type approval in Spring 1968. The 107 Model II standard accommodation is for two pilots, stewardess and 25 passengers in airliner. Seats in eight rows, in pairs on port side and single seats on starboard side (two pairs at rear of cabin) with central aisle. Airliner fitted with parcel rack and a roll-out baggage container, with capacity of approximately 680kg, located in underside of rear fuselage. Ramp of utility model is power-operated on the ground or in flight and can be removed or left open to permit carriage of extra long cargo.
The naval KV 107II 3 is a specialized MCM (mine countermeasures) helicopter, of which nine serve with the JMSDF’s 111th Air Wing. This version has up¬rated engines (1,400 shp/1044 kW) in¬stead of 1, 50 shp/932 kW) and com¬prehensive equipment for mine¬sweeping and retrieval, as well as long range tanks, cargo hook and towing gear.

Variants:

107 Model II: Standard commercial version, with two 932kW (1,250 shp) General Electric CT58 turboshaft. Available as an airliner with roll-out rear baggage container or utility model with rear-loading ramp.

CH-46A (formerly HRB-1) Sea Knight: US Marine Corps assault transport version of the 107 Model II powered by two 932kW General Electric T58-GE-8B turboshafts.

CH-46D Sea Knight: Generally similar to CH-46A, but with 1,044kW General Electric T58-GE-10 turboshaft and cambered rotor blades.

CH-46E Sea Knight: Upgraded CH-46A with 1,394kW General Electric T58-GE-16 turboshafts and other modifications including provision of crash attenuating seats for pilot and co-pilot, a crash and combat resistant fuel system and improved rescue system. Initial fleet modifications began in 1977, and the first CH-46E modified at Cherry Point NV, Naval Rework Facility was rolled out 3 August 1977.

CH-46F Sea Knight: Generally similar to CH-46D, with the same engines and rotor blades. Contains additional electronics equipment. All CH-46s delivered since July 1968 were of this version.

UH-46A Sea Knight: Similar to CH-46A. Ordered by US Navy for operation from AFS or AOE combat supply ships to transport supplies, ammunition and missiles as well as aviation spares to combatant vessels under way at sea. Secondary tasks include transfer of personnel and SAR. First deliveries in July 1964.

UH-46D Sea Knight: Generally similar to UH-46A, but with 1,044kW General Electric T58-GE-10 shaft turbine engines and cambered rotor blades. UH-46s delivered since September 1966 were of this version.

CH-113 Labrador: Six utility models delivered to RCAF in 1963-64 for SAR duties. Generally similar to CH-46A. Two 932kW General Electric T58-GE-8B turboshafts. Larger capacity fuel tanks (total 3,408 litres) giving a range of over 1,050km. All six upgraded under Search and Rescue Capability Upgrading Programme (SARCUP).

CH-113A Voyageur: Twelve aircraft in a similar configuration to that of CH-46A, delivered to Canadian Army in 1964-65 as troop and cargo carriers in logistical and tactical missions. Eight upgraded to SARCUP configuration.

Hkp 4C: Built for Royal Swedish Navy (45) and Air Force (10) in 1962-63, with Bristol Siddeley Gnome H.1200 turboshaft engines and fuel tanks of 3,786 litres capacity. Naval version has equipment for anti-submarine and mine countermeasures operations. Since upgraded with Gnome H.1400 turboshafts and new avionics.

HH-46D: Rescue version in service with the US Navy.

UH-46D: Base utility and rescue helicopter. In service with the US Navy.

KV-107/II-2: airline version, with accommodation for two flight crew, a stewardess and 25 passengers; 11 built; improved KV-107/IIA-2 available

KV-107/11-3: mine counter-measures (MCM) version for JMSDF (two), plus seven of the uprated KV-107/11A-3 model

KV-107/II-4: tactical cargo/troop transport for JGSDF with strengthened cabin flooring; 42 supplied as such, with the last of 18 uprated KV-107/ IIA-4 versions delivered in late 1981

KV-107/II-5: designation of 13 long-range SAR helicopters for JASDF; 19 uprated, but otherwise similar aircraft, are designated KV-107/IIA-5, the last three being delivered during 1981; eight KV-107/II-5s supplied to Swedish navy without powerplant, these having Rolls-Royce Gnome H.1200 turboshafts installed in Sweden; Swedish navy designation HKP-4C

KV-107/II-7: designation of one six/eleven-seat VIP transport

KV-107/11A-17: designation of single long-range transport for Tokyo Metropolitan Police Department; has a forward passenger compartment and aft cargo hold

KV-107/II-SM-1: designation of four helicopters equipped as firefighters

KV-107/IIA-SM-2: aeromedical and rescue version

Gallery

Specifications:

YHC-1 Chinook
Engines: 2 x GE T58 gas turbines
Main rotor: 48’4″
Length: 52’8″
Speed: 155 mph

Model 107
Engines: 2 x Lycoming T53 turboshaft
Rotor diameter: 50 ft / 15.24 m
Fuselage length: 44 ft 7 in / 13.59 m
Overall length: 25.4o m / 83 ft 4 in
Height: 5.09 m / 16 ft 9 in
Cruise: 120 kt / 222 kph
Endurance: 2.2 hr
Passenger capacity: 25

Model 107
Engines: 2 x Lycoming T53 turboshaft, 641kW, 877shp
Rotor diameter : 60.007 ft / 18.29 m
Length : 99.016 ft / 30.18 m
Max take off weight : 50406.3 lb / 22860.0 kg
Max. speed : 161 kt / 298 km/h
Range : 100 nm / 185 km
Crew : 2+44

Model 107-II prototype
Engines: 2 x General Electric T58-GE-6 turboshaft, 783kW

107 Model II
Engines: 2 x General Electric CT58 turboshaft, 932kW (1,250 shp)

YHC-1A
Engines: 2 x General Electric YT58 turbine, 1065shp

107M / CH-46A / HRB-1 Sea Knight
Engines: 2 x General Electric T58-GE-8B turboshafts, 932kW
accommo¬dates 26 troops or 15 casualty litters.

CH-46D Sea Knight:
Engines: 2 x General Electric T58-GE-10 turboshaft, 1,044kW
External hook capacity: 4,535kg

CH-46E Sea Knight:
Engines: two 1,870 shp (1394 kW) General Electric T58 16 turboshafts.
Main rotor diameter: 15.24 m (50 ft 0 in)
Length overall: 25.70 m (84 ft 4 in)
Height: 5.09 m (16 ft 8.5 in)
Rotor disc. Area: 364.8 sq.m (3,927.0 sq ft)
Fuselage length: 44.82ft (13.66m)
Empty weights: 5240kg (11,5851b)
Maximum take off: 9706 kg (21,400 lb)
External hook capacity: 4,535kg
Maximum speed: 267 km/h (166 mph / 144kts)
Cruising speed: 193 km/h (120 mph)
Range (3000 kg/6,614 1b payload): 175 km (109 miles)
Maximum Range: 690miles (1,110km)
Rate-of-Climb: 1,715ft/min (523m/min)
Service Ceiling: 9,498ft (2,895m; 1.8miles)
Accommodation: 3 + 25

CH-46F Sea Knight
External hook capacity: 4,535kg

RH-46E

UH-46A Sea Knight
External hook capacity: 4,535kg

UH-46B
External hook capacity: 4,535kg

UH-46D Sea Knight:
Engines: 2 x General Electric T58-GE-10 turboshafts, 1,044kW
External hook capacity: 4,535kg

CH-113 Labrador
Engines: 2 x General Electric T58-GE-8B turboshafts, 932kW, 1250 shp
Rotor dia: 50 ft 0 in (15.24 m)
Length: 83 ft 4 in (25.4 m)
Height: 16 ft 8.5 in (5.09 m)
Max TO wt: 21,400 lb (9707 kg)
Max level speed: 157 mph (253 kph)
Fuel capacity: 3,408 lt
Range: 1,050+km

CH-113A Voyageur

Hkp 4C
Engines: 2 x Bristol Siddeley Gnome H.1200 turboshaft (upgraded with Gnome H.1400)
Fuel capacity: 3,786 lt

HH-46D

UH-46D

KV-107/II-2
Engines: 2 x 1,250 shp/932 kW
Crew: 2
Accommodation: 1 stewardess, 25 passengers

KV-107/IIA
Engines: 2 x Ishikawajima Harima CT58 IHI 140 1 turbo¬shaft, 1250 shp/932 kW

KV-107/IIA-2
Engine: 2 x General Electric CT58-140-1 turboshaft, 1044kW / 1,400 shp
Rotor diameter: 15.24m
Length with rotors turning: 25.4m
Height: 5.09m
Max take-off weight: 9707kg
Max speed: 254km/h
Cruising speed: 241km/h
Service ceiling: 5180m
Range with max fuel: 1097km
Accommodation: 1 stewardess, 25 passengers

KV-107/11-3
Engines: 2 x 1,400 shp/1044 kW

KV-107/IIA-3
Engine: 2 x 1,400 shp General Electric CT58 40 I, or 1,250 shp Ishikawajima Harima CT58 IHI 140 1 turbo¬shaft

KV-107/II-4
Engines: 2 x 1,250 shp/932 kW

KV-107/II-5
Engines: 2 x 1,250 shp/932 kW

KV-107/II-7
Engines: 2 x 1,250 shp/932 kW
Seats: six/eleven-seat VIP transport

KV-107/11A-17
Engine: 2 x 1,400 shp General Electric CT58 40 I, or 1,250 shp Ishikawajima Harima CT58 IHI 140 1 turbo¬shaft

KV-107/II-SM-1

KV-107/IIA-SM-2
Engine: 2 x 1,400 shp General Electric CT58 40 I, or 1,250 shp Ishikawajima Harima CT58 IHI 140 1 turbo¬shaft